Device for removing surplus material.



F. W. KNOWLTON & T. SCOTT.

DEVICE FOR REMOVING SURPLUS MATERIAL.

APPLICATION TILED JUNE 7. 1916.

1,256,574. r T Patented Feb.19,1918.

FRANK W. KNOWLTON, OF

QUINCY, MASSACHUSETTS, AND THOMAS SCOTT, 0F

MONTREAL, CANADA, ASSIGNORS, BY MESNE ASSIGNMENTS, TO UNITED SHOE MACHINERY CORPORATION, PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

Patented Feb. 19, 1918.

Application filed June 7, 1916. Serial No. 102,326.

To all whom it may concern: 1

Be it known that we, FRANK W. Known- TON and THOMAS Soon, a citizen of the United States and a subject of the King of England, respectively, residing at Quincy, in the county of Norfolk and State of Massachusetts, and Montreal, in the Dominion of Canada, respectively, have invented certain Improvements in Devices for Bemoving Surplus Material, of which the following description, in connection with the accompanyingdrawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to devices for removing surplus material, and is herein shown as embodied in a device particularly adapted for use 1n removing from the bottom of an unfinished shoe at the toe such portions of the upper stock as form an unnecessary and undesirable projection after the pulling over and lasting operations have been completed. It will be apparent,

that the invention in its broader however,

limited to the specific emaspects is not bodiment shown nor. restricted to the illustrated use.

An important object of the invention, among others, is to provide an improved abrading ortrimming device for use in machines such as that shown in United States 1 Letters Patent No. 1,054,656, granted upon the application of R. F. McFeely, February 25, 1913, or in machines of similar type. In the use of such machines, particularly upon shoe work, it. is important that the abrading or trimming projections through the action "of which the surplus material is detached from the work be of strong and durable construction, in order to avoid breakage of some of the projections under vent undue accumulation upon its surface.

e ciency. It 0f uniformity 1n the operation of the device the ,severe strains that are frequently encountered, and it is also important, in view of the adhesive character of the stiffening substance which is commonly used in the upper materials at the toe portion of a shoe, that the device he so constructed as to preof waste material such as would tend to clog the device and detract from its efiiis also desirable, for the sake upon different portions of the work, that relation of the the abrading projections be uniform in construction and arrangement on all portions of the device.

To the above and other ends, important features of the invention reside in a novel construction and arrangement of abrading or trimming elements such as to insure increased efliciency and durability as com-,

in the McFeely patent hereinbefore mentioned,

Fig. 3 shows in vertical section a portion of a machine of which the construction shown in Fig. 2 may form a part, illustrating the manner in which the novel device ofthis invention performs, its function,

Fig. 4 is a plan view in greater detail of a portion of the device shown in Fig. 1,

Fig. 5 is a vertical section through a portion of a machine for use in making the novel device of this invention, and

Fig. 6 is an end view of one of the punches shown in Fig. 5, illustrating the punch to a die opening.

The device comprises a sheet metal plate 2 which, for use as a rotary tool in machines of the type hereinbefore mentioned, is bent in substantially cylindrical shape and may be mounted in a holder 4 (Fig. 2) the construction of which is more specifically pointed out in the prior McFeely patent. The holder 4 is secured to a shaft 6 for rotation inthe direction of the arrow, and the holder may casing 8 which is provided with an opening to admit the shoe from which surplus material is to be removed, as shown in F g. 3. Spirally formed fan blades 10 on the be mounted within a holder 4 serve to create a current of air flowing inward through the opening in the casing 8 for the purpose of carrying away the surplus material removed from the shoe;

and the action of the fan blades 4 may be supplemented, if -desired, by the use of additional suction mean such as shown in the prior McFeely patent which may be referred to also for a description of further details of construction of the illustrative machine.

The member 2 is provided upon its periphery with a large number of abrading elements 12 which are alined transversely of the periphery in in staggered relation to cause all portions of the work to be effectually treated. The elements 12 are arranged in pairs, each pair comprising projecting portions of the sheet metal turned up on two sides of a substantially triangular opening 14 in the member The projections 12 and the openings 14 are so formed that the third side 16 of the opening, at which there is no abrading projection, is at the front with reference to the direction of rotation of the device and is disposed in substantially perpendicular relation to the direction of rotation. The metal is separated, to permit the formation of the pair of projections 12, along a line indicated at a, Fig. l, which is substantially perpendicular to the line of the edge 16 at a point substantially midway between opposite ends of said edge. .Each of the pair of projections 12 thus comprises substan-' tially half of the metal turned up to form the opening 14, and consequently all the projections are uniform in height and construction and each projection is of substantial and durable form and not likely to break in use. It follows, moreover, that all the projections 12 are at substantially the same angle oblique to the direction of rotation of the device and that their highest points are at the front. Each. projection 12 thus presents a front cutting edge 18 upstanding from the surface of the member 2 and also a cutting edge 20 which slopes rearwardly, with reference to the'direction of rotation, from the high point of the projection, the two edges projections meeting at a point approximately on the peripheral surface of the member 2. It will be seen by reference to Fig. 4 that the projections 12 are turned up to such an extent as to afford an opening be.-

20,.of each pair of tween their highest point substantially or approximately equal to the Width of the opening 14.- at its front or leading side.

In the operationv of the device as thus constructed the front upstanding edges 18 serve to slit or shred the material and the edges 20, following the action of the edges 18, serve to shear off the material in their path and by reason particularly of their and this omission,

a series of rows disposed sented by the dash lines in Fig.

convergent relation and their slope toward the periphery of the member 2, to direct the waste material into the openings 14 whence it passes to the interior of the device and is removed by the'current of air. Effective clearance for the cutting edges 18 and 20 is afforded by the omission of any projection at the front of the opening 1-1, moreover, facilitates the entrance of the detached material into the opening 14 and prevents it from accumulating in front of the projections, while further insurance against clogging of the device by the waste material i afforded by the wide space provided'between the projections 12. Although the edges 18 and L 20 are described as cutting edges, this term is not usedby way of limitation but only to express what may be regarded as their characteristic action.

Figs. 5 and 6 illustratethe method of making the improved device. According to this method, two cuts are made in the metal of which the abrading device is to be formed, one cut extending in one direction only from a point midway between the ends of the other cut, andthe metal in the angles between the cuts is turned up to form a pair of abrading projections. The mechanism shown in these figures as an example of means for use 'in carrying out the method comprises two rotatable cylinders Z2 and 0, of which the cylinder 19 carries punches d and the cylinder 0 has die openings 6 to cooperate with the punches, these openings being somewhat larger in diameter than the punches. The sheet of metal from which the abrading device is to be formed, repre- 5, is fed between the cylinders by the action of the punches andby the engagement of the cylinders with the sheet, and each punch d in cooperation with a die opening 6 serves to form one of the openings 14 in the sheet and to turn up the projections 12 at the opening. To effect this result the punch is of three cornered formation, having three arrangement of the. punch on the cylinder" b, is in a plane substantially parallel to the axis of the cylinder and at the rear with reference tov the direction of rotation of the cylinder. The edges 9 andh are thus utilized to cut the material to form the edge 16 at the opening 14, cutting progressively in opposite directions from the starting point during the operation of the punch. By reason of the angular relation of the face i to the axis of the punch and the arrangement of the punch on the cylinder, the face 2' is substantially or approximately parallel to the direction of movement of the punch through the material, thus causing the edges 9 and h to form a substantially straight out without turning up the material opposed to the face 2'. Simultaneously with the action of the edges g, h in cutting the material on the line of the edge 16, the edge f of the and the edges 9 and h respectively turn up the material between the cuts to form the projections 12.

Since the die openings e, as stated, are of greater diameter than the punches d, an additional operation of the punches is to raiseor turn up slightly from the body of the plate 2 the material around the openings 14, particularly at the base of the projections 12, as shown, thus avoiding sharp bends at the base of the projections as well as increasing the height of the projections. The resulting curve in the metal around the openings 14, moreover, facilitates the admission of the detached waste material into the openings and its immediate removal by the air currents through the openings.

Having described the invention, what we claim as-new and desire to secure by Letters Patent of the United States is:

l. A device of the class described comprising a rotatable member having abrading elements upon its periphery, said elements being arranged in pairs with the elements of each pair converging rearwardly with reference to the direction of rotation of said member and having front cutting edges upstanding from the periphery of the member and also cutting edges that slope rearwardly toward the peripheral surface of the member, and the memberbeing provided with an opening between the elements of each pair, the highest points of projection of the elements of each pair being separated a dis- .the member,

tance substantially equal to the greatest dimension of said opening measured in a direction parallel to the axis of rotation of the member. t

2. A device of the class described-comprising a rotatable member formed of sheet metal and having a plurality of openings in its periphery, each opening being substantially in the form of a triangle with one side at the front of the opening in substantially perpendicular relation to the direction of rotation of the member, said member having projections on the other two sides only of each opening formed to present front cutting edges and also cutting edges sloping rearwardly toward the periphery of the metal around said openings being upraised to increase the height of said projections.

3. A device of the class described comprising a rotatable sheet metal member of substantially cylindrical shape having a plurality of substantially triangular openings in its periphery with one side of each opening disposed at the front with reference to the direction of rotation of the member, said member having projections at the other two sides of each opening presenting upstanding front cutting edges and other cutting edges sloping convergently toward the peripheryof the member, the highest points of said projections being separated a distance substantially equal to the width of the opening at its front side, and themetal around each opening being curved outwardly to increase the height of said projections and facilitate the passage of material through the openings.

In testimony whereof we have signed our names to this specification.

FRANK W. KNOWLTON. THOMAS SCOTT. 

